Double 'hmmm'... just checked the terms and conditions of the BW Qantas transaction account - clause 10 says they will give us at least 30 days' written notice of any changes. And right under that:
You agree that we may give you such notice in writing by publishing notice in a national newspaper, or on the Bankwest Qantas Rewards website located at Bankwest Personal Banking | Accounts, Credit Cards and Loans.
So they don't have to write to us individually - just put it on their website. Job done